[PATCH v5 17/19] grep API: plug memory leaks by freeing "header_list"

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When the "header_list" struct member was added in [1] it wasn't made
to free the list using loop added for the adjacent "pattern_list"
member, see [2] for when we started freeing it.

This makes e.g. this command leak-free when run on git.git:

	./git -P log -1 --color=always --author=A origin/master

1. 80235ba79ef ("log --author=me --grep=it" should find intersection,
   not union, 2010-01-17)
2. b48fb5b6a95 (grep: free expressions and patterns when done.,
   2006-09-27)

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
 grep.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/grep.c b/grep.c
index a4450df4559..c908535e0d8 100644
--- a/grep.c
+++ b/grep.c
@@ -795,6 +795,7 @@ static void free_grep_pat(struct grep_pat *pattern)
 void free_grep_patterns(struct grep_opt *opt)
 {
 	free_grep_pat(opt->pattern_list);
+	free_grep_pat(opt->header_list);
 
 	if (opt->pattern_expression)
 		free_pattern_expr(opt->pattern_expression);
-- 
2.39.0.1225.g30a3d88132d




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